Appendix A: Installation and Setup
Linx 4900 Operating Manual 166 MP65492–1
Step 2: Select the Encoder, Gearing, and Pitch
Factor
A particular combination of encoder and encoder drive (gearing or wheel)
gives a particular encoder pitch—the distance the product travels for each
cycle of the encoder output signal. The encoder pitch is multiplied by the
pitch factor (a whole number) to give the actual raster pitch. This should be
as close as possible to the required raster pitch.
The table below gives the encoder pitch for standard Linx encoders and
wheels. You can calculate the encoder pitch for other gearing or drives by
using the following:
Wheel circumference = distance the product moves for one revolution
of the encoder. This may be 3.14 x roller diameter, or 3.14 x star-wheel
diameter, and so on, depending on the application.
Figure A-11 Encoder Pitch for Standard Linx Encoders and
Wheels
The encoder pitch is multiplied by a whole number (or pitch factor) to give
the actual raster pitch. By selecting a suitable encoder and gearing, the
actual raster pitch can be made close to the required raster pitch.
Where:
The Pitch Factor is a whole number.
Encoder Pitch (mm) = Wheel Circumference (mm)
Encoder Pulses per Revolution
Where:
Actual Raster Pitch (mm) = Encoder Pitch (mm) x Pitch Factor
68542
Wheel Circumference/Encoder Pitch (mm)
Encoder p.p.r. Your Application 500 mm 333 mm 304.8 mm 200 mm 50 mm
2500 0.200 0.133 0.121 0.080 0.020
5000 0.100 0.066 0.060 0.040 0.010
10000 0.050 0.033 0.030 0.020 0.005
4900 Op Manual.book Page 166 Tuesday, September 9, 2003 12:32 PM
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